## CBSE Class 9 Maths Chapter 4 Linear Equations in Two Variables Revision Notes

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#### General Form

ax + by = c, where a, b and c are real numbers and a and b are both not zero at the same time.

**Solution of linear equation:-**

1. Linear equation having one variable has 1 solution.

2. Linear equation having two variables has infinitely many solutions.

3. The solutions of ax + by = c are obtained as ordered pairs (p, q) such that ap + bq = c.

#### Graphical Representation of Linear Equation in Two Variables

A linear equation in two variables represents a straight line geometrically. The straight line is called the graph of the linear equation in two variables.

The solutions of a linear equation can be obtained by substituting different values for x in the equation to find the corresponding values of y.

Every point that lies on the line is a solution of the linear equation.

### CBSE Class 9 Maths Chapter 4 Linear Equations in Two Variables Revision Notes PDF